JP2022062702A - Road finishing machine and screed leveling method - Google Patents

Abstract

To provide a road finishing machine having a leveling system that forms a more precise flat pavement layer.SOLUTION: A road finishing machine 1 is a screed 4 for forming a pavement layer on a roadbed 3 and includes: a screed with a traction arm 5 that is height adjustable and connected to the road finishing machine via a leveling cylinder 7 at a front traction point 6; at least one measurement means 10 that makes at least one distance measurement; recording means; a control system; and closed loop control means operatively coupled to accommodate leveling cylinder settings. The control system is configured to: calculate a correction value in response to at least one distance measurement to the roadbed and/or reference 11 taken at a measurement point 14 located in front of a screed front end 9 in the laying direction; store the correction value in the recording means at least temporarily; and calculate a leveling target value for the measurement point in consideration of the stored correction value while continuing the laying work.SELECTED DRAWING: Figure 2

Description

The present invention relates to the road finishing machine according to the preamble of claim 1. Further, the present invention relates to the method according to the method independent claim 16.

German Patent Application Publication No. 19647150, German Utility Model No. 29619831, and German Patent No. 10025474 disclose a leveling system for screed road finishing machines. These leveling systems have a traction point control loop that functions by taking into account the difference between the traction arm tilt detected by the tilt sensor and the target tilt value of the traction arm. The target tilt value is calculated based on height monitoring performed in the rear end region of the screed. In height monitoring, the target tilt value is determined by measuring the distance to the reference in the rear end region of the screed and comparing it with the target distance. In this device, the trackbed in front of the screed is inaccurately or not considered at all in the leveling process.

In the above implementation, the use of tilt sensors is particularly problematic. This is because the tilt sensor reacts sensitively to the unevenness and vibration of the roadbed during the laying work, which may adversely affect the adjustment of leveling. Further, in the above-mentioned traction point control loop, since the control at the traction point is performed at the same time as the height monitoring, a great deal of labor is required for the control of the open loop and the closed loop.

German Patent Application Publication No. 10025462 discloses a road finishing machine provided with a layer thickness measuring means for measuring the layer thickness of the formed pavement layer in the rear end region of the screed. In order to measure the laying layer thickness at the rear end of the screed, the height signal of the sensor that is fixedly placed in the combination of the screed and the traction arm and detects the height with respect to the roadbed, and the combination of the screed and the traction arm The tilt signal of the arranged tilt sensor is used.

German Patent Application Publication No. 112009001767 discloses a road finishing machine with a control system for leveling the screed. This control system has a first sensor located on the front side of the road finishing machine, in front of the material bunker, to detect the height with respect to the roadbed. Further, the control system has a second sensor that detects the height of the traction point at the front of the screed arm with respect to the roadbed.

An object of the present invention is to ensure that the leveling of a screed of a road finishing machine (road finisher) is improved by simple technical means suitable for practical use, and particularly suitable for forming a more precise flat pavement layer. It is to provide a road finishing machine equipped with a leveling system. Another object of the present invention is to provide a screed leveling method for a road finishing machine, which realizes the formation of a flatter pavement layer.

This object is achieved by the road finishing machine according to claim 1. Further, this object is achieved by the method according to claim 16.

The advantageous developments of the present invention are set forth in their respective dependent claims.

The road finishing machine according to the present invention includes a screed for forming a pavement layer on a subsoil in which the road finishing machine moves in the laying section in the laying direction. The screed is height-adjustable and has a traction arm that is attached to the road finishing machine at the front pulling point via a leveling cylinder. Further, the road finishing machine according to the present invention includes measuring means for performing distance measurement, storage means, a control system, and closed loop control means operatively connected to adapt the setting of the leveling cylinder.

According to the present invention, the control unit is configured to calculate a correction value in response to at least one distance measurement of the roadbed and / or reference to the measurement means, said at least one distance measurement. It can be done at a measurement point located in front of the front end of the screed in the laying direction. The correction value preferably reproduces the unevenness (non-landing) detected at the measurement point as the difference between the foundation and the actual roadbed having the non-landing. Further, the control unit stores the correction value in the storage means at least temporarily, and while continuing the laying work, calculates the leveling target value for the measurement point in consideration of the stored correction value, and the front end of the screed measures. When the point is reached, the leveling target value is used to control the leveling cylinder of the screed.

Thereby, the closed loop control means detects at the measurement point after the laying run, that is, when the front end of the towed screed reaches the measurement point where the correction value detects the non-landing on the roadbed. It intentionally reacts (responds) to the unevenness of the roadbed. The determination of the correction value for detecting the roadbed unevenness prior to the actual closed-loop control operation is based on a simple height measurement technique that can be used without problems in the road finishing machine. Further, the present invention has the advantage that it does not require a tilt sensor, so that the leveling system according to the present invention has a more robust structure suitable for construction sites. Further, in the present invention, since the measuring means is arranged in front of the screed and is not easily affected by the vibration operation of the screed, the distance measured by the measuring means can be considered more accurately in the leveling of the screed. In addition, the present invention provides an inexpensive solution that can be easily attached to and refurbished on road finishing machines. In the present invention, the closed loop control means reacts to the non-land detected at the measurement point only when the front end of the screed reaches the measurement point, so that the reaction timing of the leveling cylinder can be better corrected. , A pavement layer with high flatness can be formed.

Preferably, the measuring means is attached to the traction arm of the screed. Thereby, the movement of the tow arm, particularly the elevating and lowering of the tow arm, can be taken into consideration in the distance measurement. In particular, the measuring means can accurately detect roadbed unevenness in front of the screed work area, with the lateral traction arm of the road finishing machine, i.e., just beside the traveling device, and / Alternatively, the distance to a reference provided along the roadbed on the side of the screed, eg, a reference existing as a guide wire stretched to the side of the road finishing machine, can be measured. As a reference, a stretched rope, curb, and / or already formed pavement layer can be used instead of the guide wire.

According to a variant, the measuring means can be attached to the tractor of the road finishing machine, the measurements being optionally placed on a tow arm or screed to adjust a particular screed height. It can be considered together with the measured value of the measuring means.

In a particularly advantageous variant, the measuring means is located near the tow point at the front of the tow arm. This makes it possible to measure the distance to the trackbed and / or the reference in close proximity to the leveling cylinder, i.e., without being significantly affected by the tilt of the traction arm, enabling accurate leveling of the screed.

Preferably, the measuring means is rotatably attached to the traction arm, particularly at the traction point at the front of the traction arm, or at least in the immediate vicinity thereof. This allows the measuring means to maintain equilibrium, or at least automatically return to equilibrium, regardless of changes in traction arm tilt controlled during the leveling process. That is, the measuring means does not follow the change in the inclination of the tow arm. Thereby, the height measurement by the measuring means detects only the change in the distance with respect to the roadbed and / or the reference without being affected by the change in the inclination of the traction arm.

In one modification, a linear guide for the measuring means is formed on the traction arm, and the measuring means is arranged along the linear guide so that the position can be adjusted in the laying direction. Thereby, the distance between the measuring means and the front end of the screed can be adjusted. The measuring means may be rotatably attached to the linear guide to disregard changes in the tilt of the traction arm.

According to one embodiment of the invention, the measuring means has at least one first sensor for measuring the distance to the reference and at least one second sensor for measuring the distance to the roadbed. In calculating the correction value, these two height measurements (values) can be taken into consideration to detect the unevenness of the roadbed. In one variant, the measuring means has a sensor configured to detect both the distance to the roadbed and the distance to the reference. For this, for example, a radar sensor can be used.

Preferably, the first and second sensors are located at equal distances from the front end of the screed in the laying direction. As a result, the two sensors can measure the height at the same measurement point in the laying direction, and based on them, the non-landing existing at the measurement point can be accurately detected as a deviation from the foundation. In this variant, at the same point in front of the screed, two distance measurements are made, one with respect to the roadbed and one with respect to the reference, based on which the correction value for this measurement point is It is determined.

The first and / or second sensors are preferably present in the form of optical or acoustic sensors, such as laser or ultrasonic sensors. Height measurements can be made by run-time measurements, phase position measurements, and / or laser triangulation.

The determined correction value is the fault detected on the roadbed compared to the an averaged subsoil course (foundation) on the road finishing machine, eg, using the display of the screed control platform. It can be visualized as an index of land. On the display, the correction factor can be used to represent a slight unevenness and a relatively large unevenness in different colors.

The control system subtracts the distance to the roadbed measured at the measurement point by the second sensor minus the distance to the reference measured by the first sensor, and further to the foundation of the preset reference. It is advantageous to be configured to determine the correction value of the measurement point by subtracting the height. The correction value calculated by this equation for the measurement point by the control system accurately reproduces the unevenness that deviates from the foundation, that is, the uplift and dent (unevenness) of the roadbed.

Preferably, the control system is a preset leveling basis in an intermediate step for deriving a desired leveling value for a measurement point, i.e., for forming a target value for a distance relative to a sensor reference. It is configured to form the difference between the desired basic leveling value and the stored correction value. The basic leveling target value provides an index value (guidance value) for the open-loop and closed-loop control functions, and based on this value, the screed is a uniform and flat roadbed, that is, a virtual road without unevenness. It is towed assuming the floor. The correction value plays a role of adapting the basic leveling target value when the measuring means actually detects the unevenness of the roadbed, thereby calculating a more accurate leveling target value according to the unevenness with respect to the measurement point. be able to. This can optimally offset the detected non-landing.

In a favorable development, the control system calculates the leveling target value by subtracting the distance from the reference actually measured by the measuring means from the difference between the preset basic leveling target value and the stored correction value. It is configured to do. This leveling target value is presented to the closed loop control means as an input amount, and the level cylinder can be controlled to level the screed based on this input amount.

According to one embodiment, the measuring means has a plurality of sensors for measuring the distance to the track bed and / or the reference, and the control system is based on the plurality of distance measurements to the track bed and / or the reference performed simultaneously. It is configured to form each average value that is the basis for determining the correction value. By averaging multiple distance measurements against the trackbed and / or reference to determine the correction value, a filter function is formed and the closed loop control means is quasi-attenuated during the laying operation. Since it corresponds to uneven land, a smoother transition is possible in the leveling of the screed.

In one development of the present invention, the control system is configured to multiply the calculated correction value by a correction coefficient according to the shape of the screed. In addition to or in place of the screed shape, for example, the weight of the screed and / or at least the operating parameters set and / or detected there during the operation of the screed, eg, tamper speed and / or. It is conceivable to consider the heating force of the screed in the correction coefficient. In addition, the correction factor may take into account the density of the roadbed that the road finishing machine is moving during laying. Thereby, during the leveling of the screed, it is possible to arbitrarily correct the uneven land by the operation of the screed in consideration of the flexibility of the roadbed. In one embodiment, the current laying temperature of the formed pavement layer, measured behind the screed, is taken into account in the correction factor.

Preferably, the road finishing machine has at least one route measuring means for detecting the travel distance of the front end of the screed, and the travel distance of the screed detected by the route measuring means is the measuring means and the screed. When the distance to the front end is matched, the calculation of the leveling target value may be started in the control system. Therefore, the closed-loop control means can locally and accurately level the screed at the right time, at the right place, i.e., at the measurement point, based on the correction value obtained there, and as a result, at the measurement point. The measured non-landing can be reliably offset.

The control system continuously calculates the correction value while the road finishing machine is laying the laying section, stores the correction value for each measurement point, and uses each of the stored correction values for the adapted leveling. It is particularly advantageous to be configured to determine the target value. This makes it possible for the closed loop control means to reliably cope with all unevenness of the roadbed in the laying section and to form a flat pavement layer over the entire laying section.

Preferably, the control system is configured to determine the correction value using a subsoil data model based on GPS data. In the modification, the roadbed data model based on GPS data is provided with updated geo-subsoil basic data along the laying section in the road finishing machine, especially the road finishing machine. To provide to the control system, it may be stored in the control system's web-based applications, especially cloud-based applications.

According to one embodiment of the present invention, the control system is configured to calculate the correction value at the measurement point in consideration of the piston position of the leveling cylinder actually set. The piston position may be represented, for example, by the extension path of the piston, particularly detectable by the measuring means. In this way, it is possible to determine the non-landing of the roadbed even when the measuring means only measures the distance to the reference or stretched guide wire and the distance to the roadbed is not measured. .. Detection of the piston position of the leveling cylinder can be replaced by measuring the distance to the roadbed. This is advantageous in terms of certain types of trackbeds, especially porous trackbeds.

The control system includes the distance to the reference measured by the first sensor at the measurement point, the height to the base of the reference, the distance to the traction point height of the measuring means, and the extension distance of the leveling cylinder set by the piston position. From the sum of the above, the structural height between the bottom surface of the traveling device of the road finishing machine and the traction point of the leveling cylinder in the retracted state is subtracted to determine the correction value for the measurement point. It is conceivable.

The present invention also relates to a method of leveling a screed of a road finishing machine. In this method, the control system of the road finishing machine is performed by the measuring means provided on the road finishing machine with respect to the roadbed and / or the reference at a measuring point located in front of the front end of the screed in the laying direction. The correction value is calculated in response to the two distance measurements, the correction value is stored in the storage means at least temporarily, and the leveling target value for the measurement point is calculated in consideration of the stored correction value during the laying work. When the front end of the screed reaches the measurement point, the leveling target value is used to control at least one leveling cylinder of the screed.

Preferably, the measuring means makes at least two distance measurements at the measurement point in front of the screed, i.e., a measure against the reference and a measurement against the trackbed, to determine the correction value. As a result, the roadbed non-landing existing at the measurement point is accurately determined locally as a deviation from the foundation and is accurately used for screed leveling.

The leveling system according to the present invention and the leveling method according to the present invention can be carried out on both sides of the road finishing machine. Therefore, the embodiments described above in connection with the present invention can be adopted on both sides of the road finishing machine.

Embodiments of the present invention will be described in more detail with reference to the following figures.

It is a figure which shows the road finishing machine for forming a pavement layer on a roadbed. It is a schematic extraction figure of the screed of the road finishing machine provided with the measuring means by the modification of this invention. FIG. 3 is a schematic extraction diagram of a screed to which a measuring means is attached according to another modification of the present invention. 2 is a schematic diagram of a control loop according to the invention for performing leveling of the screeds of FIGS. 2 and 3. FIG. 3 is a schematic extraction diagram of a screed to which a measuring means is attached according to a further modification of the present invention. It is a schematic diagram of the control loop for leveling of screed by the modification of FIG.

In the figure, the same component is always given the same reference numeral.

FIG. 1 shows a road finishing machine 1 that moves on a roadbed 3 along a laying direction R during a laying run and forms a pavement layer 2 on the roadbed 3. The road finishing machine 1 has a height-adjustable screed 4 for (preliminarily) compacting the pavement layer 2. The screed 4 is attached to the tow arm 5, and the tow arm 5 is connected to a leveling cylinder 7 provided in the tractor 22 of the road finishing machine 1 at a front tow point (pull point) 6. The traction arm 5 functions as a lever that changes the attack angle of the screed 4 according to the displacement of the leveling cylinder, particularly in order to compensate the unevenness (non-landing) 8 of the roadbed 3.

FIG. 2 shows the screed 4, the traction arm 5, and the leveling cylinder 7 extracted and schematically shown. The measuring means 10 is arranged on the traction arm 5 between the front end 9 of the screed and the traction point 6 at the front. The measuring means 10 is configured to make at least one distance measurement to the trackbed 3 and / or the reference 11. According to FIG. 2, the reference 11 is provided as a guide wire, and the reference 11 has an average height h ₁₁ above the roadbed 3. Criteria 11 are stretched to the side of the road finishing machine 1 and provide the leveling function of the screed 4 as described in detail below.

In FIG. 2, the measuring means 10 has a first sensor 12 that measures a distance y ₁ with respect to a reference, and a second sensor 13 that measures a distance y ₂ with respect to the roadbed 3. Preferably, the first and second sensors 12 and 13 are located at the same distance x9 from the front end 9 of the screed 4 in the laying direction R. Therefore, at the measurement point 14 according to FIG. 2, two distance measurements, that is, the measurement of the distance y ₁ and the measurement of the distance y ₂ are performed.

FIG. 2 further shows that the measuring means 10 can detect the non-landing 8 of the roadbed 3 at the measuring point 14 directly below the measuring means 10 by the two sensors 12 and 13. The non-land 8 shows the difference from the foundation P. In order to offset the non-landing 8 in FIG. 2, the corresponding screed 4 when the front end 9 of the screed 4 reaches directly above the non-landing 8, that is, the measurement point 14 during the continuation of the laying work in the laying direction R. Leveling is carried out. In other words, the leveling system according to the modification of the present invention shown in FIG. 2 was detected at the measurement point 14 by the measuring means 10 when the front end 9 of the screed 4 passed the distance x9 shown in FIG. Respond to Unland 8.

FIG. 3 shows a modified example of the attachment of the measuring means 10 in FIG. The arrangement of FIG. 3 differs from that of FIG. 2 in that the measuring means 10 is directly arranged at the front traction point 6. At this position, which is also the front end of the traction arm 5, the distances y ₁ and y ₂ detected by the two sensors 12 and 13 offset the non-landing 8 in the leveling of the screed 4 to form a flat pavement layer 2. Can be adopted particularly favorably. This is because the height of the traction point 6 can be accurately detected at that point, and the leveling displacement of the screed 4 is not added to the height.

FIG. 4 schematically shows the leveling system 15. The leveling system 15 can level the screed 4 to offset the non-landing 8 of the roadbed 3 by using the measured height values detected in FIGS. 2 and 3.

The leveling system 15 includes a storage means 16, a control system 17, and a closed loop control means 18 operatively coupled to adapt the settings of the leveling cylinder 7. According to FIG. 4, the distances y ₁ and y ₂ measured by the sensors 12 and 13 are transmitted to the control system 17. The control system 17 can determine the correction value K based on the measured distances y ₁ and y ₂ in consideration of the set height h ₁₁ which is the height of the reference 11 with respect to the foundation P.

In the control system 17 of FIG. 4, the distance y ₂ with respect to the roadbed 3 measured at the measurement point 14 by the second sensor 13 minus the distance y ₁ with respect to the reference 11 measured by the first sensor 12, and further set in advance. By subtracting the height h ₁₁ of the reference point 11, the correction value K for the measurement point 14 is determined. Further, even if the control system 17 is configured to continuously store the correction value K determined for each measurement point 14 in the storage means 16 during the laying work in the laying traveling direction R over the laying section. Often, each correction value K can be used for leveling the screed 4 when the front end 9 of the screed 4 reaches the corresponding measurement point 14 in the laying section.

_FIG . 4 further shows that the current laying speed VE of the road finishing machine 1 can be displayed on the control system 17 by the speed sensor 19. The laying speed _VE transmitted to the control system 17 may be used to determine the distance x ₉ . According to FIG. 4, the path measuring means 20 for the leveling system 15 may be provided as a unit linked to or functionally independent of the leveling system 15. The route measuring means 20 detects the moving section of the distance x ₉ or the front end 9 of the screed 4 when the road finishing machine 1 moves toward the front in the laying direction R during the laying run.

FIG. 4 further shows that a preset leveling basic target value _y1-Basis is transmitted to the control system 17. Further, a correction factor c, which may be determined by the geometry of the screed 4, may be stored in the control system 17.

The control system 17 of FIG. 4 is configured to determine the movement path, that is, the movement section, through which the screed 4, particularly the front end 9 thereof has passed from the time when the screed 4 is stored, for each stored correction value K. As soon as the travel section coincides with the distance _x9 , the control system 17 deducts the correction value K from the leveling basic target value _y1-Basis . It is also possible to optionally multiply the correction value K by the correction coefficient c.

The leveling basic target value _y1-Basis can be manually set by the operator on the control panel of the road finishing machine, so that the target height of the screed 4 can be adjusted as appropriate for the laying work. The height of the screed 4 can be manually determined by the operator or measured by a layer thickness sensor (not shown).

FIG. 4 further shows that the leveling target value _y1-Soll determined for the measurement point 14 is transmitted to the closed loop control means 18 by the control system 17 in consideration of the correction value K. Further, the measured distance y ₁ is transmitted to the closed loop control means 18. The closed loop control means 18 calculates the control amount u transmitted to the actuator 21 by the difference between the leveling target value y _1-Soll calculated based on the non-landing 8 and the distance y ₁ measured at the measurement point 14. It is configured as follows. The actuator 21 is, for example, a hydraulic drive component that determines the extension distance s ₇ of the leveling cylinder 7 thereby adjusting the height h ₆ of the traction point to target the screed 4, especially the rear end of the screed. It can be positioned at h _bo .

FIG. 5 basically shows the configuration of FIG. 3, and the measuring means 10 according to FIG. 5 includes only the _first sensor 12 that measures the distance y1 with respect to the reference 11. According to the configuration of FIG. 5, the correction value K can be calculated mainly by the distance y ₁ and the extension distance s ₇ of the leveling cylinder 7. The correction value K for the non-landing 8 detected by the measuring means 10 is the distance y ₁ , the height h ₁₁ with respect to the reference 11, the distance h _s with respect to the traction point 6 on the front side of the first sensor 12, and the leveling cylinder 7. It can be calculated by subtracting the height h _zp , which is the structural height of the traveling device at the front traction point 6 with respect to the bottom surface F, from the sum of the extension distance s ₇ and the extension distance s 7.

FIG. 6 schematically shows a leveling system 15'with the configuration shown in FIG. Here, the measured distance y ₁ and the detected extension distance s ₇ of the leveling cylinder 7 are continuously transmitted to the control system 17, and based on these, a correction value K is calculated for each measurement point 14 in the laying section. And stored in the storage means 16. The correction value K can be calculated by subtracting the height h _zp in the state where the leveling cylinder 7 is retracted from the above-mentioned total. The leveling target value y 1-Soll calculated by subtracting the correction value K from the leveling basic target value y _{1-Soll stored} in the control system 17 is a measurement in which the front end 9 of the screed 4 measures the distance y ₁ at the latest. When it arrives at the point 14, it is transmitted to the closed loop control means 18 as an input amount, and the closed loop control means 18 determines the leveling cylinder 7 from the difference between the calculated leveling target value y _1-Sol and the measured distance y ₁ . To determine the control amount u of the actuator 21 for leveling the screed 4.

Claims (16)

It is a road finishing machine (1)
A screed (4) for forming a pavement layer (2) on a roadbed (3) in which the road finishing machine (1) moves the laying section in the laying direction (R), and the height is adjustable. A screed (4) having a traction arm (5) attached to the road finishing machine (1) at a front traction point (6) via a leveling cylinder (7) and at least one distance measurement. It includes one measuring means (10), a storage means (16), a control system (17), and a closed loop control means (18) operatively coupled to adapt the settings of the leveling cylinder (7). ,
The control system (17) is the roadbed (3) and / or reference (11) performed at a measurement point (14) located in front of the front end (9) of the screed (4) in the laying direction (R). ), The correction value (K) is calculated in response to at least one distance measurement, the correction value (K) is stored in the storage means (17) at least temporarily, and the laying work is continued. The leveling target value ( _y1-Sall ) for the measurement point (14) is calculated in consideration of the stored correction value (K), and the front end (9) of the screed (4) is the measurement. A road finishing machine, characterized in that, when the point (14) is reached, the leveling cylinder (7) of the screed (4) is controlled based on the leveling target value. The road finishing machine according to claim 1, wherein the measuring means (10) is attached to the towing arm (5) of the screed (4). The road finishing machine according to claim 1 or 2, wherein the measuring means (10) is arranged in the vicinity of the towing point (6) of the towing arm (5). The measuring means (10) has at least one first sensor (12) for measuring the distance (y ₁ ) with respect to the reference (11) and at least one for measuring the distance (y ₂ ) with respect to the roadbed (3). The road finishing machine according to any one of claims 1 to 3, further comprising one second sensor (13). The first sensor (12) and the second sensor (13) are located at an equal distance (x ₉ ) from the front end (9) of the screed (4) in the laying direction (R). , The road finishing machine according to claim 4. The control system (17) is measured by the first sensor (12) from the distance (y ₂ ) with respect to the roadbed (3) measured at the measurement point (14) by the second sensor (13). The measurement point is obtained by subtracting the distance (y ₁ ) with respect to the reference (11) and further subtracting the height (h11) of the preset reference (11) with respect to the roadbed (3). The road finishing machine according to claim 4 or 5, wherein the correction value (K) with respect to (14) is determined. In the intermediate step, the control system (17) forms a difference between the preset leveling basic target value ( _y1-Basis ) and the stored correction value (K), and forms the measurement point (14). ), The road finishing machine according to any one of claims 4 to 6, wherein the leveling target value ( _y1-Soll ) is derived. The control system (17) is actually measured by the measuring means (10) from the difference between the preset basic leveling target value ( _y1-Basis ) and the stored correction value (K). The road finishing according to claim 7, wherein the leveling target value ( _y1-Sall ) is calculated by subtracting the distance (y ₁ ) with respect to the reference (11). Machine. The measuring means (10) has a plurality of sensors (12, 13) for measuring a distance (y ₁ , y ₂ ) with respect to the roadbed (3) and / or the reference (11), and the control system (10). 17) is for determining the correction value (K) based on a plurality of distance measurement values (y ₁ , y ₂ ) with respect to the roadbed (3) and / or the reference (11) performed simultaneously. The road finishing machine according to any one of claims 1 to 8, wherein the road finishing machine is configured to form an average value of each of the bases. The control system (17) is characterized in that the calculated correction value (K) is multiplied by a correction coefficient (c) corresponding to the shape of the screed (4). The road finishing machine according to any one of 1 to 9. The road finishing machine (1) includes at least one route measuring means (20) for detecting a moving section of the front end (9) of the screed (4), and is detected by the route measuring means (20). When the moving section of the screed (4) coincides with the distance (x ₉ ) between the measuring means (10) and the front end (9) of the screed (4), the control system (17) says. The road finishing machine according to any one of claims 1 to 10, wherein the calculation of the leveling target value ( _y1-Soll ) is started. The control system (17) continuously calculates correction values (K) while the road finishing machine (1) is laying and traveling on the laying section, stores them, and stores the correction values. The road according to any one of claims 1 to 11, characterized in that the value (K) is configured to determine the adapted leveling target value ( _y1-Sall ). Finishing machine. One of claims 1 to 12, wherein the control system (17) is configured to determine the correction value (K) using a roadbed data model based on GPS data. Road finishing machine as described in the section. The control system (17) is configured to calculate the correction value (K) in consideration of the piston position of the leveling cylinder (7) actually set at the measurement point (14). The road finishing machine according to any one of claims 1 to 13, wherein the road finishing machine is characterized. The measuring means (10) is attached to the tractor (22) of the road finishing machine (1), and the measured value is placed on a traction arm or a screed in order to adjust a specific screed height for further measurement. The road finishing machine according to any one of claims 1 to 14, wherein the road finishing machine can be considered together with the measured value of the means. It is a method of leveling the screed (4) of the road finishing machine (1).
The control system (17) of the road finishing machine (1) is attached to the road finishing machine (1) at a measurement point (14) located in front of the front end (9) of the screed (4) in the laying direction (R). The correction value (K) is calculated in response to at least one distance measurement performed on the roadbed (3) and / or the reference (11) by the provided measuring means (10), and the correction is made at least temporarily. The value (K) is stored in the storage means (16), and the leveling target value (y _1- ) with respect to the measurement point (14) is taken into consideration in consideration of the stored correction value (K) while continuing the laying work. _Sol ) is calculated, and when the front edge (9) of the screed (4) reaches the measurement point (14), at least one leveling cylinder (9) of the screed (4) reaches the leveling target value. A method that is controlled based on.

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